For two mutually exclusive events, that subtraction step changes nothing because the overlap probability is:
AOne half only
BQuite unknown
CPlainly zero
DPlainly one
Answer & Solution
Correct answer: C. Plainly zero
1. Mutually exclusive means they never occur together.
2. So the probability of both happening is nothing.
3. The overlap is plainly zero, so the rule simplifies to plain addition.
_Source: OpenStax Introductory Statistics 2e, Chapter 3, Probability Topics._
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